services: mcron: Add log-file and date-format fields.

* doc/guix.texi (Scheduled Job Execution): Document it.
* gnu/services/mcron.scm (mcron-configuration)[log-file, date-format]: New field.
(mcron-shepherd-services): Add log-file and date-format support.
Use file-append instead of string-append.

Signed-off-by: Maxim Cournoyer <maxim.cournoyer@gmail.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/doc/guix.texi b/doc/guix.texi
index 119ff8499bc..77ee2c6e30c 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -19363,12 +19363,18 @@ specifications,, mcron,GNU@tie{}mcron}).
 @item @code{log?} (default: @code{#t}) (type: boolean)
 Log messages to standard output.
 
+@item @code{log-file} (default: @code{"/var/log/mcron.log"}) (type: string)
+Log file location.
+
 @item @code{log-format} (default: @code{"~1@@*~a ~a: ~a~%"}) (type: string)
 @code{(ice-9 format)} format string for log messages.  The default value
 produces messages like @samp{@var{pid} @var{name}: @var{message}}
 (@pxref{Invoking mcron, Invoking,, mcron,GNU@tie{}mcron}).  Each message
 is also prefixed by a timestamp by GNU Shepherd.
 
+@item @code{date-format} (type: maybe-string)
+@code{(srfi srfi-19)} format string for date.
+
 @end table
 @end deftp
 @c %end of fragment